Digital Display Asphalt Centrifuge Extractor 1.Speed variable between 500 and 3000 rpm 2. Capacity: 1500g STCT-4 Digital Display Asphalt Centrifuge Extractor ... AC220V 50HZ2. Power: 250W3. Speed variable between 500 and 3000 rpm4. Capacity: 1500g5. Time digital display, timing option: 30s, 60s, ... from running away, time to be digital displayed, variable speed, reliable performance and light weight.